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I use the Hummingbird Fishing Buddy as well.
Attached to the tube with the strap-on Holster from Cabelas.
The transducer is in the telescoping tube so no problems. Whole unit slips in and out of...

I have a Hummingbird Fishin' Buddy as well. It solves the transducer problem and getting in and out of the tube is a breeze.
I got the tube-strap-on holster from Cabelas and it workd like a charm....